Ryan Briscoe dominated the final free practice session for the Iowa Speedway round of the IndyCar Series, the Penske driver occupying the top position in the times from the minute he hit the track.
The Australian's 181mph lap wasn't threatened for much of the hour, though Marco Andretti - fresh from his 24 hours adventure at Le Mans - posted a flyer for Andretti Autosport in the final ten minutes of the session.
Will Power ended the session third fastest in the second Penske having moved ahead of the Ganassi pairing of Dario Franchitti and Scott Dixon late on.
Vitor Meira brushed the wall with some force in the Foyt car two thirds of the way through the hour, after practice had already been put under a full caution 30 minutes in for debris at Turn 4, but it didn't deter the Brazilian from setting the sixth fastest time overall.
Dan Wheldon, once again running in Army camouflage grey, set the pace early on before eventually dropping to seventh ahead of an improving-on-ovals Justin Wilson. The Dreyer & Reinbold car another to feature in the top five for a while before slipping to eighth.
Tony Kanaan split the Penskes early on but didn't improve as the session progressed to go ninth while compatriot Helio Castroneves completed the top ten.
Graham Rahal, on his first outing for D&R was 17th quickest, while Danica Patrick appeared to be struggling for pace and ended the session 22nd.
Pos Driver Team Time Gap 1. Ryan Briscoe Penske 17.7791s 2. Marco Andretti Andretti 17.7806s + 0.0015s 3. Will Power Penske 17.7919s + 0.0128s 4. Dario Franchitti Ganassi 17.8012s + 0.0221s 5. Scott Dixon Ganassi 17.8096s + 0.0305s 6. Vitor Meira Foyt 17.8101s + 0.0310s 7. Dan Wheldon Panther 17.8266s + 0.0475s 8. Justin Wilson Dreyer & Reinbold 17.839 s + 0.0599s 9. Tony Kanaan Andretti 17.8775s + 0.0984s 10. Helio Castroneves Penske 17.8821s + 0.1030s 11. Mario Moraes KV 17.9019s + 0.1228s 12. Takuma Sato KV 17.9095s + 0.1304s 13. Alex Lloyd Dale Coyne 17.9225s + 0.1434s 14. Alex Tagliani FAZZT 17.931 s + 0.1519s 15. EJ Viso KV 17.9527s + 0.1736s 16. Milka Duno Dale Coyne 17.9801s + 0.2010s 17. Graham Rahal Dreyer & Reinbold 17.9883s + 0.2092s 18. Raphael Matos de Ferran Dragon 17.9986s + 0.2195s 19. Bertrand Baguette Conquest 18.0228s + 0.2437s 20. Ryan Hunter-Reay Andretti 18.0258s + 0.2467s 21. Simona de Silvestro HVM 18.0262s + 0.2471s 22. Danica Patrick Andretti 18.0887s + 0.3096s 23. Sarah Fisher Sarah Fisher 18.1684s + 0.3893s 24. Mario Romancini Conquest 18.2472s + 0.4681s 25. Hideki Mutoh Newman/Haas 18.5436s + 0.7645s